您的家庭网络可能挤满了各种各样的Wi-Fi设备，这些设备向Wi-Fi节点进行传输；该节点如何处理所有的流量，而不使所有传入的传输发生冲突？

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者Zequez很好奇他的Wi-Fi节点是如何运行得如此顺畅，以及为什么数据会发生冲突，他写道：

I mean, I know each packet is sent with a MAC address, but what about streaming?

What happen if while the router is receiving one packet, a packet from another device arrives?

How can the router knows that the phot*** colliding into the antenna are part of the first packet or the second packet?

Or is it that the speed of light is so fast that this almost never happen and the packets are just reported as corrupt and are sent again?

是什么让那些无线传送的数据包井然有序？让我们再深入一点。

答案

SuperUser contributor Ultrasawblade提供了以下答案，并提供了有用的链接供进一步阅读：

In a wireless network, only one device is actually “speaking” at once. Each other device listens and waits for the air on that channel to be quiet before speaking. This technique is called carrier sense multiple access with collision avoidance (CSMA/CA).

An RTS/CTS exchange helps all the nodes stay in sync efficiently by providing a way for one node to say “hey, I’m going to talk for this long so wait this long” to every other node.

@Petr Ab****n is correct but I think all Wifi networks use CSMA/CA. Old 10BaseT non-switched wired networks relied on carrier sense multiple access with collision detection (CSMA/CD). Collisi*** don’t happen on networks where all nodes are connected to a switch.

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